Refresh Rate Test — Monitor Screen Hz - UFO Test - Live Refresh-Rate

Want to know your screen's real refresh rate? Hit Start, wait a few seconds, and get your display's exact Hz reading. The UFO comparison rows show 15Hz, 30Hz, 60Hz, 120Hz, 144Hz, 165, 240, and 360Hz side by side so you can see the smoothness difference with your own eyes. Monitor 30fps vs 60fps vs 120hz vs 144hz vs 240hz vs 360hz, etc.

Test 1
Choose UFO Style
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Check Refresh Rate
Press Start Test — no clicking needed, just wait
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Sampling Frames…
Keep this tab focused for accurate results
Wait... Checking
Sampling display frames…
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Hz Per Second — Frame Rate Breakdown
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Best Hz

📊 Session Stats

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Average Hz—
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Frame Time—
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1% Low Hz—
0.1% Low Hz—
95th Percentile—
99th Percentile—
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Median Hz—

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Screen Hz Tiers — How Fast Is Your Monitor?

<30 Hz
🐢 Very Low
30 Hz
📺 Low
60 Hz
✅ Standard
75 Hz
🚀 Above Average
120 Hz
⚡ Smooth
144 Hz
🎯 Gaming
165 Hz
💫 High-End
240+ Hz
🌟 Esports
Live Refresh-Rate
—Hz
Continuously measured from your display's real frame timing — always on, like testufo.com/refreshrate
Decimal Digits
How many digits after the decimal point in the Hz reading
Averaging Window (sec)
How many recent seconds of frames are used to calculate Hz
Update Interval (ms)
How often the on-screen number refreshes
Smoothing (%)
Higher smoothing reduces jitter but reacts more slowly to real changes
🛸 Multiple Framerates — UFO Motion Comparison - UFOtest
Speed scales with Hz — 15Hz crawls, 360Hz zips by. Higher Hz = faster AND smoother motion.
Refresh Rate: Hz Tester. 60hz. 120hz. 144hz. 165hz. 240hz. 360hz. Monitor Screen. UFOtest
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Frame Rate
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Pixels Per Frame
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Frame Interval
Pixel Scale:
Speed:
UFO Size:
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What Does Refresh Rate Actually Mean?

Your monitor's refresh rate is the number of times the screen redraws the image every single second. It is measured in Hz (hertz). A 60Hz screen redraws 60 times per second. A 144Hz screen redraws 144 times per second. The higher the number, the smoother everything looks — from moving your mouse to watching a ball fly across the screen in a game. Pair this reading with our fps test to see how your games are actually performing. This free tool measures that number directly in your browser using animation frame timing.

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How This Hz Checker Works

Every time your display completes one refresh cycle, the browser fires a short callback called requestAnimationFrame. This tool records the exact time of each callback using performance.now(), counts how many happen during your chosen window, and divides by the elapsed seconds to get your Hz. The result reflects what your screen is actually receiving right now — accounting for your cable, GPU, OS settings, and browser all at once. If you also want to check pixel response and smearing, our ghosting test covers that side of panel performance.

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How to Read the UFO Motion Test

After your Hz is detected, UFOs appear across the rows — 15, 30, 60, 120, 144, 165, 240, and 360Hz — and each one now moves at a speed tied to its own rate: the 15Hz row crawls, the 60Hz row moves at a normal pace, and the 360Hz row zips across extra fast. On a 60Hz screen, any row above 60Hz will look like it's skipping frames since your panel can't render that many updates per second, even though the underlying UFO is trying to move faster. Watch which rows glide smoothly at full speed and which stutter — that shows your true screen speed. For a live in-game frame-rate readout, try our fps test as well.

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60Hz, 144Hz, or 240Hz — Which Do You Need?

For everyday use and casual gaming, 60Hz is more than fine. The upgrade from 60Hz to 144Hz is where most people notice the biggest difference — motion feels cleaner and the mouse cursor glides instead of juddering. At 144Hz, each frame stays on screen for only 6.9ms compared to 16.7ms at 60Hz. If you're seeing trailing streaks behind fast-moving objects, run our ghosting test to rule out slow panel response. The step up to 240Hz is mainly useful for fast competitive games where tracking moving targets matters. Above 240Hz, most players cannot tell a visible difference in normal use.

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Refresh Rate and How Responsive Your Screen Feels

A higher refresh rate does not just make things look smoother — it also reduces how long a frame sits on your screen before the next one arrives. At 60Hz, a frame can wait up to 16.7ms. At 144Hz that drops to 6.9ms. At 240Hz it falls to 4.2ms. This is why competitive players say high-Hz monitors feel faster and more responsive, even if the actual network or input latency has not changed. Combine this reading with our fps test to get the full picture of how your setup performs in real games. Paired with a fast panel response time, a high-Hz monitor gives you the lowest possible display-side lag.

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Why Your Result Might Show Lower Than Expected

The most common reason is a wrong OS setting. Windows and macOS both let you cap the refresh rate independently of your monitor's hardware maximum — check Display Settings on Windows or Displays in macOS System Settings. HDMI 1.4 cables limit you to 60Hz at 1080p, and 4K needs DisplayPort 1.4 or HDMI 2.1 for 144Hz. Running the browser on battery with power-saving enabled can also reduce Hz dynamically. If motion still looks smeary after fixing your settings, our ghosting test can help isolate a panel response issue. Turn off battery saver, plug in, enable hardware acceleration in Chrome or Edge, and keep the tab in focus for the most accurate reading.

Screen Hz Test — Common Questions Answered

The easiest way is to use this free online Hz checker. Click Start Test, wait three seconds, and you get your screen's actual running Hz — not just what the monitor is rated for, but what it is genuinely delivering right now through your cable, GPU, and OS settings. You can also check in Windows by going to Display Settings → Advanced Display Settings, where you will see the current refresh rate listed next to your monitor's name.
A 60Hz screen updates 60 times per second and holds each frame for about 16.7 milliseconds. A 144Hz screen updates 144 times per second and holds each frame for about 6.9 milliseconds. In practice, 144Hz motion looks noticeably smoother — scrolling, dragging windows, and fast gameplay all feel cleaner. The UFO comparison on this page lets you see that difference directly on your own screen.
This almost always comes down to one of three things. First, check your OS: on Windows, go to Display Settings → Advanced Display Settings and look at the Refresh Rate dropdown — it may be set to 60Hz even though the monitor supports 144Hz. Second, check your cable: an HDMI 1.4 cable physically cannot carry more than 60Hz at 1080p, so swap it for a DisplayPort cable or HDMI 2.0 or higher. Third, make sure hardware acceleration is turned on in your browser for this test to read correctly.
Yes. Most modern smartphones use 90Hz, 120Hz, or 144Hz screens, and this tool detects them correctly in mobile browsers. One thing to watch for on Android: many phones lower their refresh rate automatically to save battery. To get the true reading, make sure your phone is plugged in, set to performance mode, and actively displaying something — then run the test. On iPhone, all models from iPhone 13 Pro and later use 120Hz ProMotion displays.
It genuinely helps in fast-paced games. A higher refresh rate means each frame reaches your eyes sooner, so when you move your aim, you see the result faster. In a first-person shooter at 144Hz, the gap between what happens in the game and what you see on screen is about 10ms smaller than at 60Hz. That is meaningful in close-range fights. For slower games or casual play, the difference is less important, but the extra smoothness is still pleasant to use.
Three seconds is the default and gives a solid reading for most displays. At 144Hz, three seconds captures 432 frames — more than enough to average out any minor timing variation. If you are on a very high Hz monitor (360Hz or above) and want extra confidence, use the 5-second option. The 1-second test is quick but sensitive to a single dropped frame, which can pull the result down. Always keep the browser tab in the foreground and avoid background downloads while the test runs.
No. VSync controls how your GPU paces its frame output relative to the display cycle, but the browser's animation frame callback fires at the monitor's own refresh rate regardless. Whether VSync is on or off in your games or GPU settings, this test will report the same Hz because it measures the screen's refresh cycle directly — not your GPU's rendering speed.
Avg Hz is the total frames counted divided by the exact test duration — the most reliable figure. Peak Hz is the highest instant speed recorded from a single frame gap; it shows your display's ceiling. Frame Interval is 1000 divided by Avg Hz, giving milliseconds between frames. Stability measures how consistent the frame timing was throughout the test — a high percentage means steady, even delivery; a low percentage means the frame gaps were uneven, which can cause visible micro-stutter even if the average Hz looks correct.